Mitsubishi NV63-SV Earth Leakage Circuit Breaker

The Mitsubishi NV63-SV is a 3-pole, 40 A molded‑case earth leakage circuit breaker (ELCB) designed for low‑voltage power distribution and protection in industrial and commercial electrical systems. It provides protection against overload, short circuit, and earth leakage, and is commonly installed in control panels, distribution boards, and machinery. This NV63-SV belongs to the Mitsubishi NV‑S Series, supports 100–440 VAC at 50/60 Hz, and offers a typical 30 mA residual current with a breaking capacity of about 7.5 kA at 440 VAC. The device uses a thermal‑magnetic trip mechanism with leakage detection and features a manual toggle, panel or surface mounting, and screw‑terminal connections. Its insulation voltage (Uimp) is ~6 kV, weight ~0.7–0.75 kg, mechanical life ~15,000 operations and electrical life ~8,000 operations, and it operates under standard industrial conditions. As an active, legacy protection device, it is commonly replaced by the NV63‑CV in many installations. Typical applications include power distribution panels, machinery protection circuits, manufacturing equipment, and building electrical systems where reliable circuit protection and personnel safety are essential.